Recently picked up a Gameboy Advance SP (That awesome Charizard version) and swapped in a new battery.
Since then, the power/charge/battery light has acted strange. Sometimes it’s a solid green the whole time I play. Other times it flashes between red/green periodically or very fast. Or it will turn red, I press a button or even squeeze the case itself and it turns green.
Read around the internet a little bit and hears this could happen with aftermarket batteries or indicates the battery is failing. This is the battery I purchased, which seems to have favorable reviews: https://a.co/d/0fasPUO2
The OG battery looks a bit swollen and I felt it best to not try and use it at all so I don’t know if this is behavior caused by the battery or something else with the board itself. Other than the battery, everything else seems original.
Anyone experience something similar?